Improvement in looms



W/TNESSES. l

VI/EN TGR @KW/M 2M gym@ WZ I N. PETERS. PHOTLJTHOGRAFHER WASH NGTON D c tnttml gieten HILAS D. DAVIS, Oli NGRTH ANDOVER, MASSACHUSETTS. y

Letters Patent No. 106,334, dated. August 16, 1870.

t IMPnovEMENT 1N LooMs.

The Schedule referredto in these Letters Patent and making part of the same.

I, HILAS D. DAVIS, ot' 'North Andover, in the county of Essex and State of Massachusetts, have invented certain Improvements in Looms, of which the following is a specification.

Nature mul Object `of the iwention.

My invention consists of certain improvements in the construction of the mechanism which works the hcddles of a fancy loom, so called, by which the operationof .the heddles isrendered more positive, and certain ditlicultie's are avoided that are to be found in other modes ot'const-ructlion. A

My iii-st improvcmentrelates to the application of the pattern-chain and its accessories to select the heddles to be raised or depressed, so that the engagement of the lit'ter and depresser with'the jacks shall be made ,positive and certain. -In the ordinary constructions ot' fancy looms the pattern-chain throws the jack in one direction only, so as to engage with the lifter or with the dept-esser, and it isthrown `in the opposite direction, to disengage it from the one and engage it with the other, by a weight or a spring, or by the draft of the cording which connects itwith the heddle, but these sometimes fail to act, and, in consequence, the shed is not properly opened, making what is called in the trade a miss-pick. The purpose of this part of my invention is to avoid this, and consist-s in the use of two needles or pushers in combination with cach jack, one of which throws the hook ot' the jack into engagement witlr the litter, and the other with the depresser, and also in combination with a pattern-chain that works both sets of needles or pushers, so that both the lifter and depresser are made to engage with thejack by the direct action of the chain.

My second improvement relates toa modilieation of the mechanism which rotates the prism upon which the'pattern-chain works, in order to avoid moving the prism when the loom is turned backward by pushing back the lay in tending the loom, by which the pat-- tern-prism may be left in a position that would break the needles or connecting parts when theloom is again started, and consists in combining with the hook o1I pawl that turns the prism, a cam and connections or other suitable devices which are worked in connection with the lay-shaft, so arranged that they will move the pawl away from the ratchet on the prism at such times as that the turning of theloom backward would do mischief, and still leave the pawl iu position at the proper time to do its Aproper work.

My third improvement relates to the construction ot' mechanism which will work the lifter and depresser by an easy movement, and also leave them at rest for a portion of the time, and consists in working-the lifter and depresser by a crank motion, which makes an entire revolution, and thenrcsts for a portion of the time, which intermittent motion is imparted to thc crank by a ratchetand intermediate gearing, or by some other suitable device as will be described.

My fourth improvement relates tothe method of connecting the cords to the jacks, so as to thereby adjust the height ot' the heddles, and consists in 'attaching to each e'nd of the jack an adj ust-able eye for vreceiving` the cord by which either end of the jack may be lengthened or shortened, as will be described.

Description.

In the drawing- Figure 1 represents the end elevation of so much of a loom as shows the application thereto of my improvements;

Figure 2 is a side elevation of the same.

Figure 3 is a sectional elevation of a part ot tig. 2; and v Figures 4 and 5 are detailed views of detached parts of the mechanism.

A is the frame of the loom.

B B aretbe heddles.

G G, 85o., are the cords for connecting the heddles with the jacks D D, Src., being led over the sheaves E E, Ste., arranged above and below the heddles, as is shown, in a well-known manner.

The cords C are connected with the jacks by adjustable extension pieces, F F, which are provided with eyes' to receive the cords, and are attached to` each end of the jacks by the clamps G.

,These clamps are attached to the jack and engage l with some one of a series of, notches in the piece F, and conline it to the edge ot' the jack either by the draft ot' the cords C, in connection with the diagonal draft of the clamp, or by a cam attached to the clamp, by the turning. ot' which the piece F and jack are drawn together, and' a projection on the piece F takes intot-he notches on the edge of the jack, which holds the piece securely in position. Both of these modes of construction are 'shown in the drawing, and various other methods of connecting the parts might be adopted which would answerl the same purpose.

The jacks D slide lengthwise in suitable guides in a framing, A', and are each provided with a vibrating hook-piece, H, which is jointed lat the middle to the projection D', near the middle of the jack.

The hook-piece H is provided, at each end, with a hook, h h', one or the other of which engages with the lifter J or depresser J', and raises or lowers the' leaf ot'heddles connected therewith in a well-known manner.

The projection D also serves to bring the jack back to a central position, by coming/fin contact with ,the 

